Last month I opened my 500 to find a little dent in the glass right in the centre. Luckily it still works fine but I have no idea how it got there. I treated it well and yet this dent somehow appeared.
I think the point HarryT is making is that you may think you were treating your 505 well but somehow you might have done something that damaged it, like a tension or stress and you honestly don't recall doing so.
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